Physicochemical Properties of Peptide



PPepDB ID:PPepDB_810
Number of amino acids:245
Molecular Weight:25813.59 Da
Theoretical pI:8.58


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)249.8%
Cysteine CYS (C)166.53%
Glutamic Acid GLU (E)41.63%
Aspartic Acid ASP (D)83.27%
Glycine GLY (G)228.98%
Phynylalanine PHE (F)145.71%
Isoleucine ILE (I)176.94%
Histidine HIS (H)10.41%
Lysine LYS (K)93.67%
Methionine MET (M)31.22%
Leucine LEU (L)145.71%
Asparagine ASN (N)135.31%
Glutamine GLN (Q)52.04%
Proline PRO (P)197.76%
Serine SER (S)239.39%
Arginine ARG (R)93.67%
Threonine THR (T)239.39%
Tryptophan TRP (W)31.22%
Valine VAL (V)114.49%
Tyrosine TYR (Y)72.86%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1141
HydrogenH1772
NitrogenN304
OxygenO341
SulphurS19

FormulaC1141H1772N304O341S19
Total Number of Atoms:3577


Total number of positively charged residues (ARG + LYS):18
Total number of negatively charged residues (ASP + GLU):12
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    27930
Absorption 0.1% (=1 g/l)    1.082,   assuming all pairs of CYS residues form cystines

Ext. coefficient    26930
Absorption 0.1% (=1 g/l)    1.043,   assuming all CYS residues are reduced
Aromaticity:0.098

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 39.69

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[26.94, 31.43, 18.37]

Amino acids in helix: V, I, Y, F, W, L || Amino acids in turn: N, P, G, S || Amino acids in sheet: E, M, A, L
Aliphatic index:72.1633
Grand average of hydropathicity (GRAVY):0.14